(n.) An animal, invisible, or nearly so, to the naked eye. See Infusoria.
(n.) A small animal, as a fly, spider, etc.
Example Sentences:
(1) It is particularly appropriate for an assemblage of protozoologists to pay homage to this intrepid "philosopher in little things," a man with an insatiable curiosity about his wee animalcules, on the tricentenary of his discovery of them, since it was an event of such long-lasting significance.
Rotifer
Definition:
(n.) One of the Rotifera. See Illust. in Appendix.
Example Sentences:
(1) Lifespan is strongly correlated (0.7009) with the length of the reproductive period in the rotifer Asplanchna brightwelli.
(2) Two possible mechanisms are discussed to explain these results: (1) cortisone stabilization of lysosomal membranes, or (2) recognition of cortisone as a hormone capable of altering resource allocation by the rotifers.
(3) The rate of lipid peroxidation (LP) was measured in rotifers reared under conditions of continuous darkness (D:D), dietary restriction, vitamin E supplementation, or elevated temperatures.
(4) They show the same buoyant density as chitin and also as the chitin-containing layers of rotifer egg-shells.
(5) The rotifer Asplanchna releases into its environment a water-soluble, nondialyzable, pronase-sensitive factor which causes uncleaved eggs of another rotifer, Brachionus calyciflorus, to develop into individuals with a pair of long, movable spines which neither their mothers nor the unaffected controls have.
(6) The jaws (trophi) of the rotifer Brachionus plicatilis are soluble in strong acids but are resistant to long treatments by strong alkali.
(7) Both high and low temperatures increased rotifer sensitivity to reference toxicants.
(8) To account for the mechanism of this unusual and novel effect it is proposed that these compounds interact with the anesthetic binding site of the rotifer cholinoceptor ionophore in the open state.
(9) It was shown by means of radiolabelling with 45 calcium that the rate of calcium accumulation in chelation-treated rotifers was markedly lower than in the untreated controls.
(10) Cortisone at 100 and 200 microM concentrations produced a significant increase in both life span and reproduction in the rotifer Asplanchna brightwelli.
(11) Extensions of life-span and reproductive period were achieved in the rotifer Mytilina brevispina var redunca by regular brief immersions in solutions of one of the following chelating agents, sodium citrate, sodium tartrate, EDTA, and EGTA.
(12) A number of compounds showing general anesthetic action in the rotifer Brachionus calyciflorus were investigated in the presence of acetylcholine.
(13) In the summer of 1982-1983 it was observed an impairment on the daily cercarial harvests which was related to ambient temperature increase, and the presence of rotifers in the aquaria water.
(14) The magnitude of cannibalism in this rotifer may be dependent upon a complex suite of heterogeneous predator-prey interactions and greatly affected by shifting densities and distributions of different clones and female morphotypes.
(15) No response was observed when rotifers were exposed to aluminum chloride, mercury chloride, pentachlorophenol, sodium arsenite, sodium azide, sodium dodecyl sulfate, or zinc chloride.
(16) Examples are provided, derived from populations having rather different lifespans such as rotifers, flies, rats and horses.
(17) Furthermore, significant quantities of calcium, which increased throughout the life-span, were withdrawn from rotifers at chelation.
(18) The rotifer Asplanchna brightwelli shows a continuous decline in swimming activity through the course of its 5-day life span.
(19) The presence of acetylcholine in the culture medium was found to result in egg retention in the bdelloid rotifer Philodina acuticornis in a dose-dependent fashion, with no other discernible physiological effect.
(20) The results of this study indicate that levels of the SOR and lipid peroxides are coupled to rotifer life-span and that activation of phospholipase A2 may contribute to the elevation of these agents in older animals.